I'm not sure on the specifics as to how this is done. I'm pretty sure it's something that may require a truck roll, if it's a matter of you being on BPON and it requires everyone on the splitter/OLT to have the same type of connection. There isn't a big difference between PPPoE and DHCP besides the increase in MTU and of course, the MAC address lock for the router (making hooking up a router less complicated) as it's provisioned high enough to make up for the overhead associated from PPPoE and the underlying ATM network.
The charge to move you onto the Gigabit Ethernet from ATM shouldn't happen though. It's something Verizon eventually has to do as they phase out the original FiOS gear with newer gear for support of new speeds and more capacity. The question is, does Verizon have the capability for your line to move you onto DHCP and off of PPPoE/ATM.
Perhaps someone better suited and more familiar with the underworking of FiOS can help.
